I have been selling on eBay for almost a year now. I have sold just over 100 items. I will say majority of my transactions have gone through with no problems whatsoever. However, there was one time where the seller wanted to return an expensive item, mostly because of buyer's remorse, and I will say it was VERY stressful. That one situation that is so bad, can really outweigh all of the good of eBay unfortunately.
Plus reading this sub-forum doesn't help. I think alot of people are petrified of eBay because of all of the stories on here. In all likelihood, if you sell on the Bay, you'll be fine. It's just those few situations that truly suck that make it not worthwhile.